This isn't good news for difficulty, it would definitely open open the doors for the masses.
Difficulty would rise in any way because Bitmain was always easily out of stock, so they never had problem of selling. Yeah, adding of paypal payment means new potential customers but it has nothing to do with your proposal and also everyone who buys antminer or bitmain's product is in touch with bitcoin and bitcoin payment isn't problem for them. Here is the most amazing fact: You can buy miners with 6 month zero fee loan.
Btw if anyone knows, is that 6 month zero interest available only for USA customers?
Not sure if it would even affect difficulty or anything that much at all, all the big buisnesses and mining rigs are pretty set and this will just help some regular Joe's who don't have 2 grand ready to spend on some gear be able to mine some crypto-currencies.
I checked the website, and maybe I'm stupid but I wasn't able to see or get the 6 month option, and I was either forced to pay instantly or just cancel the order. Bummer for me I guess.